xsl:sort

Hi All

i m using
<xsl:sort order="descending" data-type="text" select="get-users-UserName"/>

the question is that can i send order,data-type and select attributes in xml
and use them accordingly ?? like

<xsl:sort order="{//sort-Order}" data-type="{//sort-DataType}"
select="{//sort-Field}"/>

where nodes values would be.
sort-Order == descending
sort-DataType == text
sort-Field == get-users-UserName


qAZI aSIM.